Preparation process and device of metal potassium

Abstract

The invention belongs to the technical field of potassium metal production, and particularly provides a potassium metal preparation technology and device.The potassium metal preparation device comprises a roller type crusher, a discharging port of the roller type crusher communicates with a feeding port of a drying machine through a vibration feeder, and a discharging port of the drying machine communicates with a feeding port of a potassium chloride storage tank through a conveying auger; a discharging port of the potassium chloride storage tank is communicated with a first feeding port in the top of the reaction furnace, a second feeding port is further formed in the top of the reaction furnace and communicated to a discharging port of the metal sodium storage tank, the reaction furnace is a replaceable inner sleeve type reaction furnace, a discharging port of the reaction furnace is communicated to a feeding port of the sodium chloride temporary storage tank through a melt pump, and an exhaust port is further formed in the top of the reaction furnace. The exhaust port is communicated to the condensing tower through an air suction fan, and a liquid outlet in the bottom of the condensing tower is communicated to the bottom of the clamping groove containing paraffin oil. By replacing the inner sleeve of the reaction furnace, the stability of high-temperature reaction of metal sodium and potassium chloride can be ensured. The preparation of the metal potassium can be realized based on the preparation device of the metal potassium.

Description

Technical Field

[0001] The present invention relates to the technical field of potassium metal production, and in particular to a process and device for preparing potassium metal. Background Art

[0002] Potassium metal is an active metal with a wide range of applications in industrial production. It can be used to prepare a variety of chemical substances, such as potassium hydroxide and potassium sulfate, which are important in the fields of pharmaceuticals, agriculture, electronics, etc.

[0003] The industrial production of metallic potassium is a delicate process. The main method is to use metallic sodium and molten potassium chloride (KCl) to react under high temperature conditions in a reactor. The reaction temperature is usually around 850°C. After the reaction, sodium, potassium chloride and sodium chloride are all in a molten state, while potassium is in a gaseous state, which is conducive to the next step of production.

[0004] This high-temperature reaction method of sodium metal and potassium chloride has lower production costs, higher safety and environmental protection. However, the replacement reaction of sodium metal and potassium chloride is very violent, which can easily cause corrosion to the reactor and damage the furnace body. Summary of the invention

[0005] In view of the above-mentioned defects, the present invention provides a process and device for preparing metallic potassium, which can replace the inner sleeve of a reactor for high-temperature reaction of metallic sodium and potassium chloride.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a process and device for preparing potassium metal, comprising a roller crusher, wherein the discharge port of the roller crusher is connected to the feed port of a dryer through a vibrating feeder, the discharge port of the dryer is connected to the feed port of a potassium chloride storage tank through a conveying auger, the discharge port of the potassium chloride storage tank is connected to a first feed port on the top of a reactor, and the top of the reactor is also provided with a second feed port connected to the discharge port of a sodium metal storage tank; The reactor comprises a first shell, a driving motor is fixed on the top of the first shell, a stirring shaft extending into the first shell is installed at the output end of the driving motor, and a plurality of stirring impellers are arranged on the stirring shaft, the upper part of the first shell comprises a first inner sleeve, a first outer jacket is arranged outside the first inner sleeve, a water outlet is arranged on one side of the upper part of the first outer jacket and is connected to the liquid inlet end of the heat medium heating device, the lower part of the first shell is a second outer jacket half shell, a second shell is hinged on one side of the second outer jacket half shell, the second shell and the second outer jacket half shell are sealed and fixed to form a second outer jacket at the lower part of the reactor, a water inlet is arranged on one side of the bottom of the second outer jacket half shell and is connected to the liquid outlet end of the heat medium heating device, a water pipe is arranged on the upper part of one side of the second outer jacket half shell and is connected to the first outer jacket, the second outer jacket half shell and the second shell are provided with a second inner sleeve, the top of the second inner sleeve and the bottom of the first inner sleeve are detachably sealed and fixed, and the bottom of the second inner sleeve is provided with a reactor discharge port that can be opened and closed; The discharge port of the reaction furnace is connected to the feed port of the sodium chloride cooling tank through a melt pump. An exhaust port is also provided on the top of the reaction furnace. The exhaust port is connected to the condensation tower through a pipeline provided with an air suction fan. The liquid outlet at the bottom of the condensation tower is connected to the bottom of the clamping tank containing paraffin oil.

[0007] As a further improvement of the present invention, a plurality of first support plate groups are provided between the second outer jacket half shell and the second inner sleeve, and a plurality of second support plate groups are provided between the second shell and the second inner sleeve.

[0008] As a further improvement of the present invention, the number of the first support plate groups and the number of the second support plate groups are both 3, the adjacent first support plate groups are arranged at 60°, and the adjacent second support plate groups are arranged at 60°.

[0009] As a further improvement of the present invention, each group of the first support plate groups includes five first support plates arranged vertically, and each group of the second support plate groups includes five second support plates arranged vertically.

[0010] As a further improvement of the present invention, a first feed meter is provided at the discharge port of the potassium chloride storage tank, and a second feed meter is provided at the discharge port of the metallic sodium storage tank.

[0011] As a further improvement of the present invention, a plurality of mounting blocks are circumferentially arranged on the top of the second inner sleeve, and the mounting blocks cooperate with the mounting grooves provided on the bottom of the first inner sleeve.

[0012] As a further improvement of the present invention, the second shell is connected to one end of the second outer jacket half shell by a plurality of hinged hinges, and the second shell is fixedly connected to the other end of the second outer jacket half shell by bolts and nuts.

[0013] As a further improvement of the present invention, a sealing protrusion is provided on the inner side of the connection between the second shell and the second outer jacket half shell, and a sealing groove matching the sealing protrusion is provided on the inner side of the connection between the second outer jacket half shell and the second shell.

[0014] A process for preparing potassium metal, which adopts the above-mentioned potassium metal preparation device to achieve the preparation of potassium metal, and the process specifically comprises the following steps: S1: Pretreatment of potassium chloride. Use a roller crusher to crush potassium chloride into potassium chloride particles, use a vibrating feeder to send the potassium chloride particles to a dryer for drying, and then use a conveying auger to transport the dried potassium chloride particles to a potassium chloride storage tank for temporary storage; S2: transporting potassium chloride in the potassium chloride storage tank and metallic sodium in the metallic sodium storage tank to the reactor, and heating the reactor. The potassium chloride and metallic sodium are heated in the reactor to produce a substitution reaction to produce gaseous metallic potassium and molten sodium chloride; S3: Gaseous potassium metal enters the condensation tower from the reactor and is condensed into liquid potassium by the condensation tower. The liquid potassium is discharged from the bottom of the condensation tower and enters the clamp tank, which contains paraffin oil to prevent oxidation. The liquid potassium is collected after cooling; S4: The molten sodium chloride is discharged from the reactor into a sodium chloride temporary storage tank for cooling.

[0015] Beneficial effects of the present invention: In view of the extremely violent reaction between metallic sodium and potassium chloride under high temperature conditions, a reactor with an inner sleeve that can be easily disassembled and replaced is designed to protect the reactor body from corrosion, thereby effectively ensuring production safety. In addition, the reactor inner sleeve is divided into two parts, the lower part of the inner sleeve that directly contacts the production raw materials only needs to be replaced, which can greatly reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a device for preparing potassium metal according to the present invention; Figure 2 It is an axonometric diagram of the reactor; Figure 3 is a schematic top view of the first shell; Figure 4 yes Figure 3 AA section view in FIG. Figure 5 It is a schematic diagram of the internal structure of the reactor; Figure 6 This is an axonometric diagram of the second inner sleeve.

[0017] In the figure: 1-roll crusher, 2-vibrating feeder, 3-dryer, 4-conveyor auger, 5-potassium chloride storage tank, 6-metal sodium storage tank, 7-condensation tower, 8-clamping groove, 9-sodium chloride cooling tank, 10-reaction furnace, 1000-first feeding port, 1001-motor mounting seat, 10010-shaft hole; 1002-second feeding port, 1003-exhaust port, 1004-water outlet; 1005-first shell, 10050-first inner sleeve, 10051-first outer jacket , 10052-second outer jacket half shell, 10053-first support plate, 10054-mounting groove, 10055-sealing groove, 10056-sealing protrusion; 1006-second shell, 10060-second support plate, 1007-hinge hinge, 1008-reactor discharge port, 1009-water inlet, 1010-water pipe, 1011-second inner sleeve, 10110-mounting block, 1012-first fixed plate, 1013-second fixed plate, 11-drive motor. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific examples described herein are only used to explain the present invention and are not intended to limit the present invention. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and are not used to limit the present invention. In addition, in all embodiments, the same figure numerals represent the same elements.

[0019] See also Figure 1 , Figure 2 The present invention provides a preparation device of metallic potassium, comprising a roller crusher 1, wherein a vibrating feeder 2 is arranged at the bottom discharge port of the roller crusher 1. A dryer 3 is arranged below one side of the vibrating feeder 2, and the feed port of the dryer 3 is connected to the output end of the vibrating feeder 2. A conveying auger 4 is arranged on one side of the discharge port of the dryer 3, and the feed port of the conveying auger 4 is connected to the discharge port of the dryer 3, and the discharge port of the conveying auger 4 is connected to a potassium chloride storage tank 5.

[0020] As a further explanation of this embodiment, blocky potassium chloride is fed into the feed port of the roller crusher 1, and crushed into small particles by the roller crusher 1. The granular potassium chloride is transported to the dryer 3 through the vibrating feeder 2, and is dried by the dryer 3. The dried potassium chloride is transported to the potassium chloride storage tank 5 through the conveying auger 4 for temporary storage.

[0021] The potassium metal preparation device also includes a reactor 10, and a first feed port 1000 and a second feed port 1002 are provided at the top of the reactor 10. The first feed port 1000 is connected to the discharge port of the potassium chloride storage tank 5, and a first feed meter is provided at the discharge port of the potassium chloride storage tank 5. The second feed port 1002 is connected to the discharge port of the sodium metal storage tank 6, and a second feed meter is provided at the discharge port of the sodium metal storage tank 6.

[0022] As a further explanation of this embodiment, the amount of potassium chloride entering the reaction furnace 10 can be controlled by the first feed meter, and the amount of metallic sodium entering the reaction furnace 10 can be controlled by the second feed meter.

[0023] See also Figure 2 , Figure 3 , Figure 4 The reactor 10 includes a first shell 1005, which is divided into an upper part and a lower part. The upper part of the first shell 1005 includes a dome-shaped first inner sleeve 10050, a motor mounting seat 1001 is provided at the top center of the first inner sleeve 10050, and an axial hole 10010 is provided at the center of the motor mounting seat 1001. A driving motor 11 is installed on the motor mounting seat 1001, and a stirring shaft is fixed to the output end of the driving motor 11 through a coupling. The stirring shaft extends from the axial hole 10010 into the interior of the first shell 1005, and a plurality of stirring impellers are fixed on the stirring shaft. The first feeding port 1000 is arranged at the top of the first inner sleeve 10050 and is located on one side of the motor mounting seat 1001, and the second feeding port 1002 is arranged at the top of the first inner sleeve 10050 and is located on the other side of the motor mounting seat 1001. An exhaust port 1003 is also provided at the top of the first inner sleeve 10050.

[0024] As a further explanation of this embodiment, the driving motor 11 can drive the stirring shaft to rotate, thereby driving the stirring impeller to rotate, and stirring and mixing the materials in the reaction tank.

[0025] The first outer jacket 10051 is disposed outside the first inner jacket 10050, and the bottom of the first outer jacket 10051 is sealed and separated. A water outlet 1004 is provided on the upper side of the first outer jacket 10051 near the second feeding port 1002. A water pipe 1010 is disposed on the lower side of the first outer jacket 10051 near the first feeding port 1000. One end of the water pipe 1010 is connected between the first outer jacket 10051 and the first inner jacket 10050, and the other end of the water pipe 1010 is connected to the lower part of the first outer shell.

[0026] As a further explanation of this embodiment, heat medium can be introduced between the first outer jacket 10051 and the first inner jacket 10050 through the water pipe 1010 to ensure the temperature of the upper part of the reaction furnace 10, and the water outlet 1004 can lead out the heat medium.

[0027] The lower part of the first outer shell is a semi-dome-shaped second outer jacket half shell 10052, and the thickness of the second outer jacket half shell 10052 is consistent with the thickness of the first outer jacket 10051. Three groups of first support plate groups are arranged inside the second outer jacket half shell 10052, and the adjacent first support plate groups are arranged at 60 degrees. Each group of first support plate groups includes 5 first support plates 10053 from top to bottom. The width of the first support plate 10053 is equal to the distance between the first outer jacket 10051 and the first inner jacket 10050. A water inlet 1009 is provided at the bottom of the second outer jacket half shell 10052, and the water inlet 1009 can be connected to the heat medium heating device.

[0028] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 A sealing groove 10055 is provided along the circumference of the inner side of the edge of the second outer jacket half shell 10052. A second fixing plate 1013 is provided on one side edge of the second outer jacket half shell 10052, and a second threaded fixing hole is provided on the second fixing plate 1013.

[0029] As a further explanation of this embodiment, the second outer jacket half shell 10052 is half of the outer jacket of the lower part of the reactor 10 .

[0030] A plurality of hinged hinges 1007 are provided on the edge of the other side of the second outer jacket half shell 10052 , one end of the hinged hinge 1007 is fixedly connected to the outside of the second outer jacket half shell 10052 , and the other end of the hinged hinge 1007 is fixedly connected to the edge of one side of the outside of the second shell 1006 .

[0031] A first fixing plate 1012 is disposed on the other side edge of the second housing 1006 . A first threaded fixing hole is formed on the first fixing plate 1012 . The first threaded fixing hole matches with a second threaded fixing hole on the second fixing plate 1013 .

[0032] The inner side of the edge of the second shell 1006 is provided with a sealing protrusion 10056 along its circumference. The sealing protrusion 10056 on the second shell 1006 can cooperate with the sealing groove 10055 on the second outer jacket half shell 10052 for sealing, and a sealing gasket is also provided between the two. Three groups of second support plate groups are also provided inside the second shell 1006. The adjacent second support plate groups are arranged at 60 degrees. Each group of second support plate groups includes five second support plates 10060. The five second support plates 10060 are arranged vertically. The width of the second support plate 10060 is consistent with that of the first support plate 10053.

[0033] As a further explanation of this embodiment, the second outer jacket half shell 10052 and the second shell 1006 can be fixed to form the outer jacket of the lower part of the reactor by matching the first threaded fixing hole and the second threaded fixing hole and fixing them by bolts and nuts. At this time, the sealing protrusion 10056 provided on the inner side of the edge of the second shell 1006 matches the sealing groove 10055 on the second outer jacket half shell 10052, and the sealing gasket further enhances the sealing performance.

[0034] The inner side of the bottom of the upper part of the first shell 1005 is provided with a plurality of mounting grooves 10054 along the circumferential direction, and the mounting grooves 10054 are arc-shaped grooves with one side open. The reactor 10 also includes a second inner sleeve 1011, and a plurality of mounting blocks 10110 matching the mounting grooves 10054 are fixedly connected to the top of the second inner sleeve 1011. A reactor discharge port 1008 that can be opened and closed is provided at the bottom of the second inner sleeve 1011. A sealing gasket is also provided between the second inner sleeve 1011 and the first shell 1005.

[0035] As a further explanation of this embodiment, the mounting block 10110 is inserted into the outside of the mounting groove 10054, and then the second inner sleeve 1011 is rotated so that the mounting block 10110 rotates along the mounting groove 10054 and enters into the mounting groove 10054 to achieve the installation and fixation of the second inner sleeve 1011.

[0036] The furnace structure of the jacket arranged outside the reaction furnace 10 is circulated and connected to the heat medium heating device. A melt pump is arranged at the bottom of the reaction furnace 10. The feed end of the melt pump is connected to the discharge port 1008 of the reaction furnace, and the discharge port of the melt pump is connected to the sodium chloride cooling tank 9.

[0037] The upper part of the reaction furnace 10 is also provided with an exhaust port 1003 connected to the inside of the furnace body, and a high temperature resistant industrial grade suction fan is provided at the exhaust port 1003. The air inlet end of the suction fan is connected to the exhaust port 1003 of the reaction furnace 10, and the air outlet end of the suction fan is connected to the condensation tower 7. The bottom of the condensation tower 7 is provided with a liquid outlet, and the liquid outlet is connected to the bottom of the clamping groove 8.

[0038] The process for preparing metallic potassium according to the above-mentioned metallic potassium preparation device comprises: S1: Pretreatment of potassium chloride. The roll crusher 1 is used to crush potassium chloride into potassium chloride particles, and the potassium chloride particles are sent to the dryer 3 for drying through a vibrating feeder, and the dried potassium chloride particles are transported to the potassium chloride storage tank 5 for temporary storage through a conveying auger.

[0039] S2: The potassium chloride in the potassium chloride storage tank 5 and the metallic sodium in the metallic sodium storage tank are transported to the reactor 10, and the reactor 10 is heated. The potassium chloride and the metallic sodium are heated in the reactor 10 to generate a substitution reaction to produce gaseous metallic potassium and molten sodium chloride.

[0040] S3: Gaseous potassium metal enters the condensation tower 7 from the reaction furnace 10 and is condensed into liquid potassium by the condensation tower 7. The liquid potassium is discharged from the bottom of the condensation tower 7 and enters the clamping tank 8. The clamping tank 8 contains paraffin oil to prevent oxidation. After the liquid potassium is cooled, the material is collected.

[0041] S4: The molten sodium chloride is discharged from the reaction furnace 10 and enters the sodium chloride cooling tank 9 for cooling.

[0042] The working principle and use process of this embodiment: When in use, the reactor 10 is mounted on a bracket, and the heat medium can be heated by a heat medium heating device and input into between the second outer jacket and the second inner jacket 1011 at the lower portion of the reactor 10, thereby ensuring the reaction temperature. Meanwhile, the heat medium can pass through the water pipe 1010 and enter between the first outer jacket 10051 and the first inner jacket 10050 at the upper portion of the reactor 10, thereby ensuring the temperature of the upper portion of the reactor 10 and preventing the upper portion of the reactor 10 from being too low, thereby causing the generated gaseous metallic potassium to condense when it encounters cold in the reactor 10, resulting in the inability to output the product.

[0043] When feeding, potassium chloride particles and metallic sodium all react in the lower part of the reactor 10, that is, in the second inner sleeve 1011. Since the replacement reaction between metallic sodium and potassium chloride is very intense, the second inner sleeve 1011 as a direct contact point is easily corroded and damaged, so the second inner sleeve 1011 needs to be replaced regularly.

[0044] When replacing, remove the reactor 10 from the bracket and lay it flat, then open the second shell 1006, remove the drive motor 11 from the motor mounting seat 1001, and move the stirring shaft to the side of the shaft hole 10010 by dragging the drive motor 11. When the bottom of the stirring shaft enters the first inner sleeve 10050, rotate the second inner sleeve 1011, move the mounting block 10110 on the top of the second inner sleeve 1011 to the opening of the mounting groove 10054, then remove the second inner sleeve 1011, install a new second inner sleeve 1011, reinstall the drive motor 11, and seal and fix the second shell 1006 to the first shell 1005 again, and then place it on the bracket for reuse.

[0045] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above implementation measures. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A device for preparing potassium metal, characterized in that: The invention comprises a roller crusher (1), wherein the discharge port of the roller crusher (1) is connected to the feed port of a drying machine (3) via a vibrating feeder (2), the discharge port of the drying machine (3) is connected to the feed port of a potassium chloride storage tank (5) via a conveying auger, the discharge port of the potassium chloride storage tank (5) is connected to a first feed port (1000) at the top of a reaction furnace (10), and the top of the reaction furnace (10) is also provided with a second feed port (1002) connected to the discharge port of a metallic sodium storage tank (6); The reaction furnace (10) comprises a first shell (1005), a driving motor (11) is fixed on the top of the first shell (1005), a stirring shaft extending into the interior of the first shell (1005) is installed at the output end of the driving motor (11), and a plurality of stirring impellers are arranged on the stirring shaft, the upper part of the first shell (1005) comprises a first inner sleeve (10050), a first outer jacket (10051) is arranged outside the first inner sleeve (10050), a water outlet (1004) is arranged on one side of the upper part of the first outer jacket (10051) and is connected to the liquid inlet end of the heat medium heating device, and the lower part of the first shell (1005) is a second outer jacket half shell (10052), and a second shell (10052) is hingedly connected to one side of the second outer jacket half shell (10052). (1006), the second shell (1006) and the second outer jacket half shell (10052) are sealed and fixed to form a second outer jacket at the lower part of the reactor (10), a water inlet (1009) is provided on one side of the bottom of the second outer jacket half shell (10052) and is connected to the liquid outlet of the heat medium heating device, a water pipe (1010) is provided on the upper part of one side of the second outer jacket half shell (10052) and is connected to the first outer jacket (10051), a second inner sleeve (1011) is provided inside the second outer jacket half shell (10052) and the second shell (1006), the top of the second inner sleeve (1011) is detachably sealed and fixed to the bottom of the first inner sleeve (10050), and a reactor discharge port (1008) that can be opened and closed is provided at the bottom of the second inner sleeve (1011); The discharge port (1008) of the reaction furnace is connected to the feed port of the sodium chloride cooling tank (9) via a melt pump. The top of the reaction furnace (10) is also provided with an exhaust port (1003). The exhaust port (1003) is connected to the condensation tower (7) via a pipeline provided with an air suction fan. The liquid outlet at the bottom of the condensation tower (7) is connected to the bottom of a clamping tank (8) containing paraffin oil.

2. The device for preparing potassium metal according to claim 1, characterized in that: A plurality of first support plate groups are provided between the second outer jacket half shell (10052) and the second inner sleeve (1011), and a plurality of second support plate groups are provided between the second shell body (1006) and the second inner sleeve (1011).

3. The device for preparing potassium metal according to claim 2, characterized in that: The number of the first support plate groups and the number of the second support plate groups are both 3, and the adjacent first support plate groups are arranged at 60°, and the adjacent second support plate groups are arranged at 60°.

4. The device for preparing potassium metal according to claim 3, characterized in that: Each group of the first support plate groups includes five first support plates (10053) arranged vertically, and each group of the second support plate groups includes five second support plates (10060) arranged vertically.

5. The device for preparing potassium metal according to claim 1, characterized in that: A first feed meter is provided at the discharge port of the potassium chloride storage tank (5), and a second feed meter is provided at the discharge port of the metallic sodium storage tank (6).

6. The device for preparing potassium metal according to claim 1, characterized in that: A plurality of mounting blocks (10110) are circumferentially arranged on the top of the second inner sleeve (1011), and the mounting blocks (10110) cooperate with mounting grooves (10054) provided on the bottom of the first inner sleeve (10050).

7. The device for preparing potassium metal according to claim 1, characterized in that: The second shell (1006) is connected to one end of the second outer jacket half shell (10052) via a plurality of hinged hinges (1007), and the other end of the second shell (1006) is fixedly connected to the second outer jacket half shell (10052) via bolts and nuts.

8. The device for preparing potassium metal according to claim 7, characterized in that: A sealing protrusion (10056) is provided on the inner side of the connection between the second shell body (1006) and the second outer jacket half shell (10052), and a sealing groove (10055) matching with the sealing protrusion (10056) is provided on the inner side of the connection between the second outer jacket half shell (10052) and the second shell body (1006).

9. A process for preparing potassium metal, characterized in that: The process uses the potassium metal preparation device according to any one of claims 1 to 8 to achieve the preparation of potassium metal, and the process specifically comprises the following steps: S1: pre-treating potassium chloride by crushing the potassium chloride into potassium chloride particles using a roller crusher (1), sending the potassium chloride particles to a dryer (3) for drying via a vibrating feeder, and conveying the dried potassium chloride particles to a potassium chloride storage tank (5) for temporary storage via a conveying auger; S2: transporting the potassium chloride in the potassium chloride storage tank (5) and the metallic sodium in the metallic sodium storage tank into the reaction furnace (10), and heating the reaction furnace (10); the potassium chloride and the metallic sodium are heated in the reaction furnace (10) to generate a substitution reaction to produce gaseous metallic potassium and molten sodium chloride; S3: Gaseous potassium metal enters the condensation tower (7) from the reaction furnace (10) and is condensed into liquid potassium by the condensation tower (7). The liquid potassium is discharged from the bottom of the condensation tower (7) and enters the clamping tank (8). The clamping tank (8) contains paraffin oil to prevent oxidation. After the liquid potassium is cooled, the material is collected; S4: The molten sodium chloride is discharged from the reaction furnace (10) and enters a sodium chloride temporary storage tank for cooling.

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